Power Module - Type 12AA

Power Module - Type 12AA
The Power Module Type 12AA is a two-channel, battery-operated, microphone power supply, amplifier and filter unit. It has two 7-pin LEMO 1B input connectors for microphone preamplifiers as well as two BNC output sockets. Both channels have an overload indicator and a gain that can be set to -20 dB, 0 dB, +20 dB or +40 dB.

The A-weighting network fulfils the requirements of IEC 60651 for Type 0 Sound Level Meters. The high-pass filters are 3-pole butterworth filters with a cut-off frequency at 20 Hz.

The Type 12AA has a battery indicator to monitor battery condition and an input socket for an external power supply. It also has a built-in 1 kHz precision calibration generator with adjustable levels for both channels. The generator can be activated either via a front-panel button or remotely.

The cabinet width is 1/12th of a standard 19" rack. With the rack mounting system Type AK0040, 12 of these Power Modules can be mounted in a standard 19" rack.

19" Rack-mounting System AK0040
The AK0040 is a shelf for mounting instrument cabinets, e.g. G.R.A.S. Power Modules, and can itself be mounted in a standard 19" instrumentation rack via its flanges. It can house instruments 133 mm high and is wide enough to contain instruments amounting up to a total width of 430 mm.
Specifications Type 12AA
Input channels:
2 x 7-pin LEMO 1B connectors
Outputs channels:
2 × BNC sockets
Gain settings:
-20 dB, 0 dB, +20 dB, +40 dB
Preamplifier supply:
28 V or 120 V
Polarisation voltage:
200 V or 0 V
Frequency response:
3.5 Hz - 200 kHz
A-weighting network:
IEC 60651 Type 0
Output impedance:
30 Ohm
Power supply:
10 x AA alkaline batteries
or 12 - 18 V DC mains/line adaptor for 220/115 V
height: 132.6 mm
width: 34.6 mm
depth: 196 mm
770 g
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